Comments on: Climate Variability in the Americas from Treeline Environmentshttp://climateaudit.org/2007/03/31/climate-variability-in-the-americas-from-treeline-environments/
by Steve McIntyreTue, 03 Mar 2015 20:05:30 +0000hourly1http://wordpress.com/By: "Correlates well (r = 0.70) with gridded June–July temperatures" « Climate Audithttp://climateaudit.org/2007/03/31/climate-variability-in-the-americas-from-treeline-environments/#comment-259794
Sun, 03 Apr 2011 15:40:07 +0000http://www.climateaudit.org/?p=1312#comment-259794[…] I’ve been re-visiting some proxy data; I noted last summer that Rob Wilson had archived a considerable amount of B.C. data in Aug 2007 and noticed that he subsequently archived the data versions as used in Wilson et al 2007 at NCDC here in Sept 2007. (Not all of Rob’s data is archived as he isn’t in control of all the data that he’s been involved with; for example, Brian Luckman of the University of Western Ontario is holding out on archiving data, notwithstanding commitments of the IAI program discussed here. […]
]]>By: twqhttp://climateaudit.org/2007/03/31/climate-variability-in-the-americas-from-treeline-environments/#comment-83579
Sat, 12 May 2007 11:14:15 +0000http://www.climateaudit.org/?p=1312#comment-83579Re: The environment of the White Mountains bristlecones and the Dulan junipers is obviously moisture stressed. Their latitude 37-38N is bracketed to the north and south by precipitation rather than temperature reconstructions; in the Dulan case, any relationship with temperature is actually thought to be negative. So if a treeline site is not necessarily a temperature proxy, how does one actually provide an objective ex ante criterion for a site to be a “temperature” proxy.

It is very funny. You have not been to this place for on-site monitoring. Why are you still so adamant about it? It is funny, funny and funny! Science is based on evidence, not your allegation. It does not mean it just because you are so insistent on it. If you want to confirm something, I suggest you should go for fieldwork and make a experiment monitoring, and only in this case, I can believe what you said. Otherwise, I am afraid that some misinformation produce.

so – completely different environments and completely different species.

I don’t see that anything in the above post states otherwise. Upper and lower treelines have been discussed at this site previously in connection with bristlecones. For greater clarity, I’ve added a couple of sentences to the above post referring to Rob Wilson’s temperature reconstructions as follows. (I’ve discussed data archiving as data archiving was one of the stated objectives of the program and I’d spent much of the post reporting on that issue.

The review also notes that:

“Luckman and Wilson (2005) have also developed a millennial length (950-1994) maximum summer temperature reconstruction from the Columbia Icefield area in the Canadian Rockies that appears to reflect broad Northern Hemisphere trends.”

Although the reconstruction and chronology are archived, the underlying measurement data is not archived, nor is the data for other treeline sites reported in Wilson and Luckman 2003, a reconstruction of maximum summer temperature from upper treeline sites.

I didn’t mean to neglect Rob Wilson’s work on temperature reconstructions in this summary. My attention was really directed towards work less familiar to me and noting the very low return of archived results from this program. I will endeavor to re-read Rob’s work.

Rob, one of the underlying problems here is that IPCC 4AR failed to do an assessment of recent dendro work, by and large limiting itself to reporting on the multiproxy reconstructions. I’ve spent quite a bit of time recently trying to see what up-to-data proxy information actually looks like and welcome any suggestions on series or studies that you think I should look at it.

]]>By: Steve McIntyrehttp://climateaudit.org/2007/03/31/climate-variability-in-the-americas-from-treeline-environments/#comment-83577
Mon, 02 Apr 2007 16:15:59 +0000http://www.climateaudit.org/?p=1312#comment-83577#2. Look forward to your report and will be happy to post up pictures with your discussion.
]]>By: Steve Sadlovhttp://climateaudit.org/2007/03/31/climate-variability-in-the-americas-from-treeline-environments/#comment-83576
Mon, 02 Apr 2007 15:57:41 +0000http://www.climateaudit.org/?p=1312#comment-83576Fresh from a self funded quick, qualitative field observation at the Western boundary of the Great Basin. More to come on this. Suffice it to say, I will be addressing the issue of moisture limitations at tree line in alpine terrains which are biotic islands in arid and semi arid zones.
]]>By: jaehttp://climateaudit.org/2007/03/31/climate-variability-in-the-americas-from-treeline-environments/#comment-83575
Sun, 01 Apr 2007 01:27:32 +0000http://www.climateaudit.org/?p=1312#comment-83575

To date, every U.S. treeline site discussed by Woodhouse in a publication has been for a drought/precipitation reconstruction; chronologies as far north as British Columbia were used for precipitation reconstructions: